There's a memory leak in /drawpic.
It only happens when drawing an .ico file, the problem doesn't appear with .bmps at all.
To reproduce it, use this alias (be warned; you will have to restart mIRC after running /leaktest as it will be completely messed up smile):
Code:
alias leaktest {
  var %x = $+(",$$sfile(c:\*.ico,Choose an icon file),"),%i = 5000
  window -pf @leaktest -1 -1 16 16
  while (%i) {
    drawpic @leaktest 0 0 %x
    dec %i
  }
  close -@ @leaktest
}

Then, try to enter the mIRC setup or open some other dialogs...

Thanks for your attention smile